Gohighlevel Contacts API
61
AI ReadinessAI-Aware (B-)61/100
Community OpenAPI document · agent-readyCRMContact Managementbearer32 EndpointsREST
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For Agents
Manage HighLevel CRM contacts and their related tasks, notes, tags, appointments, campaigns, and workflows through 32 endpoints under the LeadConnector base URL.
Use for: Find a HighLevel contact and check whether it is a duplicate of an existing record, I want to create a follow-up task on a contact and mark it complete later, Add a list of tags to a contact to enroll it in the right nurture sequence, List all appointments booked against a HighLevel contact
Not supported: Does not handle calendar configuration, conversation messaging, payments, or sub-account provisioning - use for HighLevel contact, task, tag, note, appointment-read, campaign, and workflow operations only.
The HighLevel Contacts API exposes 32 endpoints for managing contacts, tasks, notes, tags, appointments, campaigns, workflows, and follower lists inside the HighLevel marketing CRM. It supports duplicate detection, bulk tag operations, and lookups across nested resources such as a contact's tasks and appointments. Designed for agencies that build automations on top of HighLevel sub-accounts, the API uses bearer tokens with location and agency scope variants so requests respect the account hierarchy.
Install Jentic One Beta
Connect the Contacts API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Contacts API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fgohighlevel.com%2Fgohighlevel" | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fgohighlevel.com%2Fgohighlevel" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with Contacts API.
Search contacts and detect duplicates by email, phone, or custom field
Create, update, and complete tasks attached to a specific contact record
Add or remove tags in bulk to drive workflow and campaign segmentation
Enroll contacts into HighLevel campaigns and trigger automation workflows
Read appointments associated with a contact and write notes against the timeline
Manage followers on a contact so the right team members get visibility
Use Cases
Patterns agents use Contacts API for, with concrete tasks.
★ Agency Lead Routing Automation
Marketing agencies running HighLevel sub-accounts can route inbound leads to the right pipeline by creating contacts, tagging them, and enrolling them into campaigns through the API. The Contacts API handles duplicate detection so a returning lead is updated rather than duplicated, and tag-driven workflows fire the correct nurture sequence within minutes of capture.
Search for a contact by email, add the tag 'qualified-lead', and enroll the contact into campaign id cmp_123.
Task Management on Customer Records
Customer success teams use the Contacts API to attach tasks to a contact record so follow-ups stay in context. Agents create tasks with due dates, mark them complete when the work is done, and read open tasks across a contact to build dashboards or daily call lists without leaving HighLevel.
Create a task titled 'Renewal call' on contact contact_42 with due date 2026-07-01 and mark it complete after the call.
Bulk Tag Operations During Migrations
When migrating contacts from another CRM into HighLevel, the bulk tag endpoints let teams classify thousands of records by source, lifecycle stage, or product interest in a single pass. Combined with workflow triggers, this turns a flat import into an active segmentation in one deployment.
Tag 5,000 imported contacts with 'migrated-2026-q2' and 'source-typeform' using the bulk tag endpoint.
AI Agent CRM Updates via Jentic
An AI agent handling a sales conversation can update HighLevel contact records, log notes summarising the call, and trigger a workflow without the developer wiring REST clients. Through Jentic the agent searches for the right Contacts API operation by intent, loads its schema, and executes against the LeadConnector base URL using a scoped credential.
After a sales call, append a note summarising the conversation to contact contact_88 and trigger workflow wf_renewal.
Key Endpoints
32 endpoints — the highlevel contacts api exposes 32 endpoints for managing contacts, tasks, notes, tags, appointments, campaigns, workflows, and follower lists inside the highlevel marketing crm.
METHOD
PATH
DESCRIPTION
POST
/contacts/search
Search contacts by filters
GET
/contacts/search/duplicate
Detect a duplicate contact
POST
/contacts/{contactId}/tasks
Create a task on a contact
POST
/contacts/{contactId}/tags
Add tags to a contact
DELETE
/contacts/{contactId}/tags
Remove tags from a contact
GET
/contacts/{contactId}/appointments
List appointments for a contact
GET
/contacts/{contactId}/notes
List notes on a contact
POST
/contacts/search
Search contacts by filters
GET
/contacts/search/duplicate
Detect a duplicate contact
POST
/contacts/{contactId}/tasks
Create a task on a contact
POST
/contacts/{contactId}/tags
Add tags to a contact
DELETE
/contacts/{contactId}/tags
Remove tags from a contact
GET
/contacts/{contactId}/appointments
List appointments for a contact
GET
/contacts/{contactId}/notes
List notes on a contact
Jentic AI Readiness Score
This API is usable in Jentic One now. Its AI-readiness score against Jentic's framework shows where it stands today and where improvements would make it even easier for agents to use.
C
Contacts API
- AI-Aware (B-)61/100
51
Foundational Compliance67
Developer Experience & Jentic Compatibility49
AI-Readiness & Agent Experience94
Agent Usability75
Security55
AI DiscoverabilityPowered by JenticScoring Framework 1.0.0 | Scoring Engine 0.4.0
Show dimension breakdown
51
Foundational Compliance
Base layer of spec validity and structural soundness.
Grade: C-Signals: 4
74%
Lint Results
Aggregated quality score from linter diagnostics, weighted by severity.
87%
Resolution Completeness
Percentage of `$ref` references that resolve successfully.
0%
Specification Validity
Checks whether the API description parses successfully and conforms to its declared specification (e.g., OpenAPI).
42%
Structural Integrity
Structural correctness score based on schema issues using logarithmic dampening.
67
Developer Experience & Jentic Compatibility
Clarity, completeness, and ingestion readiness for developers and tooling.
Grade: B+Signals: 4
47%
Example Density
How richly the API is illustrated with examples.
98%
Example Validity
Percentage of examples that conform to their schemas.
50%
Response Coverage
Percentage of operations with complete response definitions (success, client error, server error).
73%
Tooling Readiness
Health of API ingestion, bundling, and resolution within Jentic pipelines.
49
AI-Readiness & Agent Experience
Semantic breadth, depth, and agent comprehension for AI systems.
Grade: D+Signals: 4
33%
Description Coverage
Coverage of descriptions across API elements.
0%
Error Standardization
Coverage of RFC 9457 Problem Details for error responses.
100%
OperationId Quality
Coverage, uniqueness, and casing consistency of operationIds for AI inference.
63%
Summary Coverage
Coverage of summaries across operations/tags/info.
94
Agent Usability
Functional utility, complexity comfort, and AI orchestration readiness.
Grade: A+Signals: 1
94%
Complexity Comfort
Agent comfort level based on API operational and structural complexity.
75
Security
Trust, risk posture, and security compliance.
Grade: A-Signals: 1
75%
Authentication Strength
Average quality of security schemes based on authentication method strength (weakest link for OAuth2).
55
AI Discoverability
Findability, semantic richness, and reasoning readiness.
Grade: CSignals: 1
55%
Descriptive Richness
Clarity and depth of descriptions across API elements.
Score it yourself
Every API in the directory is allowlisted, so you can re-score it with no key required.
npx @jentic/api-scorecard-cli score <openapi-url>Why Jentic?
What agents get from Jentic-routed access to this vendor.
Setup
Wiring HighLevel by hand means implementing its bearer auth against services.leadconnectorhq.com, tracking whether a token is scoped to a location or an agency, and mapping the contact, task, tag, and note endpoints yourself. Through Jentic you install once, import the Contacts API from the API Directory, store the token once, and your agent calls it.
Permission scoping
HighLevel puts the contact id in the URL path (/contacts/{contactId}/...), so a rule can pin your agent to one contact's operations: it can add tasks, tags, and read appointments and notes for that contact. You choose the operations it may call, so removing tags via the DELETE endpoint is not included unless you add it.
Credential isolation
Your HighLevel token is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.
Intent-based discovery
Agents search Jentic by intent such as 'tag a HighLevel contact' or 'find duplicate contacts', and Jentic returns the matching Contacts API operation with its input schema so the agent calls the right endpoint without browsing the LeadConnector docs.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Contacts API through Jentic.
What authentication does the HighLevel Contacts API use?
The Contacts API uses bearer token authentication on the Authorization header, with five scoped scheme variants (bearer, Location-Access, Location-Access-Only, Agency-Access, Agency-Access-Only) so a token only acts on the sub-account or agency level it was issued for. Through Jentic the bearer token is held in the encrypted vault and never enters the agent context.
Can I add tags in bulk with the HighLevel Contacts API?
Yes. POST /contacts/{contactId}/tags accepts an array of tag names and DELETE /contacts/{contactId}/tags removes them, and a Bulk tag endpoint group lets you act on many contacts in one call instead of looping per record.
What are the rate limits for the HighLevel Contacts API?
HighLevel applies per-location and per-burst limits documented at highlevel.stoplight.io. The OpenAPI spec does not encode the exact numbers, so check the LeadConnector developer portal for the current daily and burst caps before running large migrations.
How do I trigger a HighLevel workflow for a contact through Jentic?
Search Jentic for 'add a contact to a HighLevel workflow', load the schema for the POST workflow trigger endpoint under /contacts/{contactId}/workflow, and execute with the contactId and workflowId. Jentic injects the bearer token at execution so the agent only handles business arguments.
Can I detect duplicates before creating a contact?
Yes. GET /contacts/search/duplicate accepts identifiers like email and phone and returns the matching contact if one already exists, which is the recommended pattern before creating a new record from a form submission or import.
Does the Contacts API cover appointment booking itself?
No. GET /contacts/{contactId}/appointments only reads appointments associated with a contact. The appointment creation and calendar configuration endpoints live in the broader HighLevel Calendars API, not in the Contacts spec.
Can I limit what my agent is allowed to do with the HighLevel Contacts API?
Yes. Because you run Jentic One yourself, your own rules decide which Contacts API operations the agent may call and which credential it uses. Since HighLevel puts the contact id in the URL path, such as /contacts/{contactId}/tasks and /contacts/{contactId}/notes, you can pin the agent to a single contact and grant only the operations you want, for example creating tasks, adding tags, and reading appointments and notes. Anything you leave out stays off, so the DELETE tag endpoint is not available unless you explicitly include it.
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